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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Sep. 26, 2014	Dec. 31, 2013
Inventory Disclosure [Abstract]
Raw materials	$ 38,281	$ 34,749
Work-in-process	11,069	9,744
Finished goods	11,403	10,682
Demo and consigned inventory	2,062	3,115
Total inventories	$ 62,815	$ 58,290

Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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